Motor vehicle



Jan. 14, 1930. J. A. GRANSTEDT MOTOR VEHICLE Filed March 29, 1929 Patented Jan. 14, 1930 STATES OLOF FOGELQVIST, OF

P AT

T GFFICEI SUNDSVALL, SWEDEN MOTOR VEHICLE Application filed March 29, 1929, Serial No.

This invention relates to motor vehicles for high speed, particularly flying machines.

The object of the invention is to reduce the formation of vacuum behind the vehicle body the said vacuum originating an increased air resistance and a formation of eddies causing waste of energy.

It has already been proposed to reduce said inconveniences by giving the body of the vehicle a stream-line shape having the stern tapered backwards, but the formation of vacuum and the air resistance caused thereby have yet been very great, particularly at high speeds.

According to the invention the said inconvenience is reduced to a minimum by providing two propellers at the rear end of the vehicle body having their shafts directed obliquely in relation to the longitudinal direction of the vehicle, and a guide blade apparatus behind each propeller said guide blade apparatus having all of the outer edges of its guide blades outside the vertical sides of the vehicle body.

The air currents originated by said two propellers are blown into said guide blade apparatus and turned rearwards therein thus forming a backward directed air current to fill the vacuum behind the vehicle body and generating a force which propels the vehicle.

In the annexed drawings one embodiment of the invention is shown as applied to a flying machine. Fig. 1 shows a side elevation of a flying machine having a propeller device according to the invention. Fig. 2 is plan of Fig. 1, partly in section.

The body 1 of the flying machine has paral lel vertical sides in contrast to the usual stream-line designs and is provided with a main propeller 2 in its tapering fore end in well-known manner. The upper and lower sides of the body 1 are extended rearwards to horizontal planes 3, which widen rearwards and project behind and outside the remaining parts of the body. Outside said planes 3 two additional propellers 4 are provided having their shafts directed obliquely forwards in relation to the longitudnial. direction of the flying machine and journalled in vertical supports or posts 5 between the 351,096, and in Sweden November 12, 1927.

planes 3 and in bearings 6 in the body. The propellers 4 are driven from the motor shaft 8 of the flying machine by means of suitable transmissions, for instance bevel gearings 7 The planes 3 are joined by vertical studs or posts 9 which are as well as the propeller supports 5 formed as guide blades for the air currents. The vertical sides of the body are between the planes 3 formed as curved walls 10 of such shape that the air currents are turned backwards while forming a minimum of eddies. The rudder 11 of the flying machine is hinged to the rear end of the body.

The device described functions as follows: During the flight air currents of high speed are driven by the propellers 4 laterally into the air guide apparatus 3, 5, 9, 10 said currents leaving the flying machine substantially in rearward direction. Thus, the formation of vacuum behind the flying machine and the origination of eddies are reduced as much as possible. The air currents, when turned backwards between the guide blades and along the surfaces 10, originate a component of force which is directed forwards and, thus,

aid in propelling the flying-machine. The

usual propeller 2 can, therefore, be less than that of normal flying machines of the same size. 1 Instead of the usual speed thereof a propelling force-is attained when a device according to the invention is used. Simultaneously the advantageis obtained that a higher steering effect than that ofordinarv flying machines is attained because strong air currents sweep along the sides of the rudder, which in contrast therewith in ordinary flying machines is placed in the vacuum behind the flying machine. Moreover, the space in the body of the flying machine is more spacious and easier toutilize effectively because the vertical sides ofthe body are parallel and do not converge backwards. r

The invention is not limited to the embodiment shown and described but can be modified in various manners within the scope of the invention.

formation of vacuum behind the flying machine decreasing the The invention is, of course,

also applicable to other motor vehicles of high speed than flying machines.

What I claim is 1. In a motor vehicle for high speed, a 5 body, two propellers at the rear portion of said body having their shafts directed v obliquely forwards in relation to the longi- 'tudinal direction of the vehicle, and a guide blade apparatus behind each of ,said propellers, said guide blade apparatus having all of the outer edges of its guide blades outside the vertical sides of the vehicle body.

2. In a motor vehicle for high speed, a body, two propellers at the 'rear portion of said body having their shafts in the same horizontal level and directed obliquely -forwardsin-relation to the longitudinal direction oft heve'hiclatwo horizontal planes widened rearwards onlevel With the'upperand-lower -s'ides of said body respectively, vertical posts forming guide blades between the outer edges of said ;planes,-andcurved rear walls of said body, "all of said posts having their outer edges'outside the vertical sides of sa'id body '25 andbeliindsaid propellers.

8. In a motor vehicle'forhigh speed,-abody,

' two :propellers at the rear portion of said body having their shafts in the same horizontal level and directed obliquely forwards in relation to the longitudinal direction of the vehicle, two "horizontal planes widened rear-wards on level with the upper and lower sides of said. vehicle body respectively, vertical'posts forming guideblades between the 3 outer edges of said planes,bearings for said propeller shafts in two of said posts, and curved rear walls of the vehicle body, all of said posts having their outer edges outsidethe'verticalsides'of said bodyand behind 40 said propellers.

4. In amotor vehicle for high speed, a body, va :main propeller ;at the fore end. of said body, a motor for said main propeller, two propellers at the rear portion of said I "bodv having their shafts in the same {horizontal level and directed obliquely forwards in relation-to the longitudinaldirection of the vehicle, transmissions between said ipro- *pel ler shafts and the motor of-th'e-vehicleytwo horizontallplanes widenedarearwards on level with the upper :and lower sides of said vehiole body :r'espectivel-y,"vertical posts formmg guide blades between the outer edges -of said planes, bearings for-said propeller shafts in two of-said posts, and curved rear Walls of the vehicle body, all .of said posts having their outer edges outside the vertical sides of said body andbehind saidpropellers.

.In testimony whereof I have signed my name.

J OHAN ANSH-ELM .GRANSTEDT. 

